Marketable Securities (current and non-current) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Marketable securities classification
Current marketable securities	$ 860	$ 756
Non-current marketable securities	1,360	1,453
Total marketable securities	2,220	2,209
U.S. government agency securities
Marketable securities classification
Current marketable securities	106	103
Non-current marketable securities	115	131
Foreign government agency securities
Marketable securities classification
Current marketable securities	60	30
Non-current marketable securities	60	95
Corporate debt securities
Marketable securities classification
Current marketable securities	141	143
Non-current marketable securities	674	638
Commercial paper
Marketable securities classification
Current marketable securities	1	60
Certificates of deposit/time deposits
Marketable securities classification
Current marketable securities	19	20
Non-current marketable securities	10	20
U.S. treasury securities
Marketable securities classification
Non-current marketable securities	49	49
U.S. municipal securities
Marketable securities classification
Current marketable securities	0	2
Asset-backed securities
Marketable securities classification
Current marketable securities	533	398
Non-current marketable securities	440	509
Asset-backed securities Automobile loan related
Marketable securities classification
Current marketable securities	365	287
Non-current marketable securities	230	298
Asset-backed securities Credit card related
Marketable securities classification
Current marketable securities	114	52
Non-current marketable securities	127	128
Asset-backed securities Equipment lease related
Marketable securities classification
Current marketable securities	35	30
Non-current marketable securities	34	37
Asset-backed securities Other asset-backed securities
Marketable securities classification
Current marketable securities	19	29
Non-current marketable securities	49	46
Auction rate securities
Marketable securities classification
Non-current marketable securities	$ 12	$ 11

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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